Welcome to My First Website!，Welcome to My New Website!，Welcome to My Website!

欢迎来到我的第一网站！欢迎来到我的新网站！

```markdown

Welcome to my first website where you can explore various topics and engage with others in real-time.

### .NET Website Development Instance

In today's digital age, the internet has become an essential tool for information acquisition and communication. The .NET framework, which is an open-source framework, is widely used for building web applications, mobile applications, and social media platforms. Below, I will demonstrate how to use the .NET framework to develop a simple web application.

#### Example One: Creating a Simple Web Application

##### Step 1: Create a New ASP.NET Web Forms Project

Open Visual Studio and select "New Project". In the pop-up dialog box, select "ASP.NET Web Application (.NET Framework)" template, then click "Next".

In the "Name" field, enter the project name (MyFirstWebApp), and in the "Location" field, specify the project location. Click "Create".

##### Step 2: Add a New Page

Right-click on the solution resources manager and select "Add" -> "New Item", in the pop-up dialog box, select "ASP.NET Web Page", then click "Next".

In the "Name" field, enter the page name (Home.aspx), then click "Finish".

##### Step 3: Edit the Page Code

Double-click on "Home.aspx" file, open its source code editor. You will see the default HTML structure and some basic tags.

```html

```

##### Step 4: Edit the Page Code Behind

In the project resources manager, find and double-click "Home.aspx.cs" file, here编写的是后端代码，用于处理用户请求.

```csharp

using System;

using System.Web.UI;

namespace MyFirstWebApp

public partial class Home : Page

{

protected void Page_Load(object sender, EventArgs e)

{

// Page loading logic

}

}

```

##### Step 5: Run the Project

Click the Visual Studio menu bar's "Start" -> "Debug" or press F5 key, your website should run and display in the browser.

### Example Two: Integrating Database Access

To enhance the functionality of the website, we can integrate database access using Entity Framework.

##### Step 1: Install Necessary NuGet Packages

In Visual Studio, right-click on the solution resources manager and select "Manage NuGet Packages", search and install "Microsoft.EntityFrameworkCore" and "Microsoft.EntityFrameworkCore.SqlServer".

##### Step 2: Configure Connection String

In "App.config" or "web.config" file, configure the database connection string.

```xml

```

##### Step 3: Create Entity Class

In the project resources manager, right-click on "Models" folder, select "Add" -> "New Item", in the pop-up dialog box, select "Class", named "User.cs".

```csharp

using System.ComponentModel.DataAnnotations;

public class User

[Key]

public int Id { get; set; }

[Required(ErrorMessage = "用户名不能为空")]

public string Username { get; set; }

[Required(ErrorMessage = "密码不能为空")]

[DataType(DataType.Password)]

public string Password { get; set; }

```

##### Step 4: Create Context Class

In the project resources manager, right-click on "Models" folder, select "Add" -> "New Item", in the pop-up dialog box, select "Class", named "DbContext.cs".

```csharp

using Microsoft.EntityFrameworkCore;

namespace MyFirstWebApp

public class ApplicationDbContext : DbContext

{